A message to clients in the dashboard widget received from another site
I would like to display various notifications on the dashboard of client sites. This is not a list of posts, just a message. The message itself is located on my main site. That is, I change the messages on my site and it is displayed accordingly in the dashboard widget on client sites.
Now I do this by adding a widget with an iframe. But this seems to me a bad decision. In addition, the fixed height in the iframe is a big hindrance.
iframe src=https://example.com/dash_widget/ width=100% height=250px/iframe
Tell me, please, is there any more reliable design for the implementation of this task? Maybe someone has already done this.